Tension type headaches are the most common, affecting upwards of 75% of all headache sufferers. As many as 90% of adults experience tension–type headache.
Tension–type headaches usually involve a steady ache, rather than a throbbing one, are described as a feeling of pressure or tightening, may last minutes to days, affect both sides of the head, and and do not worsen with routine physical activity. It may also be accompanied by photophobia or phonophobia (hypersensitivity to light and noise, respectively.). Nausea is usually absent. Some people get tension–type (and migraine) headaches in response to stressful events. Tension–type headaches may also be chronic, occurring frequently or daily. Psychologic factors have been overemphasized as causes of headaches.